Within bronfenbrennerâs ecological-systems approach, he called the historical context that affects other systems the ) ecosystemb) chronosystemc) mesosystemd) macrosystem

b. chronosystem

Explanation:

Chronosystem -

Urie Bronfenbrenner in the year 1979 , developed the most famous ecological systems theory , which helps to explain the external factors which determines the growth and development of a child.

The chronosystem consists of all the environmental event that occur in the development age of the child , is referred to as chronosystem.

hence, from the question , the correct term from the given options is chronosystem.

the answer to your question is,

d. when a child was born.

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